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From "Suresh Srinivas (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2971) some improvements to the manual NN metadata recovery tools
Date Wed, 22 Feb 2012 19:13:49 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13213870#comment-13213870
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Suresh Srinivas commented on HDFS-2971:
---------------------------------------

Sorry, I still have hard time understanding how this is useful. How does printing the highest
generation stamp is of use? Could you please describe what problem this solves. Large gaps
in generation stamp should not happen. But even detecting that, minimum gap to look for etc.,
does not seem useful.

Do you mean transaction ID instead of generation stamp?
                
> some improvements to the manual NN metadata recovery tools
> ----------------------------------------------------------
>
>                 Key: HDFS-2971
>                 URL: https://issues.apache.org/jira/browse/HDFS-2971
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: libhdfs
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>         Attachments: 2012-02-17_0001-OEV-enhancements-pt.-2.patch, HDFS-2971__print_highest_generation_stamp.txt
>
>
> Some improvements to the manual NN metadata recovery tools.
> Specifically, we want the Offline Edit Viewer (oev) tool to prints out the highest generation
stamp that was encountered when processing the edit log.
> We also want OEV to look for large gaps in the generation stamp, as these can indicate
corruption.  The minimum gap to look for should be configurable with -G or --genStampGap.

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